Square D QO370 - 70 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState

Meet the Square D QO370 — a 70 A, 240 V, 3-pole plug-in molded case circuit breaker designed to deliver dependable branch circuit protection for panelboards and load centers. Built for fast, confident installs and quick replacements, this unit keeps critical electrical workflows running smoothly in a range of settings from homes to light commercial environments.

Why the QO370 stands out

• Fast plug-in connection means reduced downtime during installation or replacement — push in and lock the breaker in place without costly wiring changes.
• Thermal-magnetic trip unit provides stable, repeatable protection against both overloads and short circuits, helping to prevent nuisance trips while safeguarding connected equipment.
• OEM-ready compatibility is designed to pair with matching Square D load centers and panelboards for a seamless, reliable fit and predictable performance.
• Versatile for multiple environments suitable for residential, commercial, and light industrial applications where dependable overcurrent protection matters.

Technical specifications

• Manufacturer: Square D
• Part Number: QO370
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 70 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Ideal use scenarios

• Replacing a blown breaker in existing Square D panelboards or load centers to restore circuit protection with minimal downtime.
• Upgrading or adding a 240 V, 3‑pole protection solution for multi-wire or three-phase electrical configurations.
• Upkeep of commercial or light industrial panels where reliable, predictable trip behavior reduces maintenance calls.

Installation, compatibility, and best practices

Choose the QO370 when you require a plug-in solution that aligns with OEM panelboards and load centers. Ensure the replacement matches the panel’s listed amp rating and pole count, and follow standard electrical safety practices during installation. The unit’s plug-in design simplifies conductor routing and seating, helping you complete installations with confidence and precision.

In environments where downtime is costly, the QO370’s rapid plug-in capability combined with a thermal-magnetic trip mechanism translates to tangible reliability and quicker service turns. This is a practical, purpose-built choice for technicians who value consistent protection, straightforward replacement, and panelboard compatibility.

Designed for AmpState customers who demand dependable protection solutions, the Square D QO370 delivers clear, field-proven performance for residential, commercial, and light industrial applications. When you need a trusted 70 A, 240 V, 3-pole plug-in breaker that fits right in with your existing Square D hardware, the QO370 is engineered to perform where it matters most — protecting people, wiring, and equipment with precision and ease.